You may not like this but as a parent and older(ummm) adult I would say be very Careful and slow down the relationship. He has some serious thinks to fix. Be his freind but don't be depndant on him it could be too much for him to deal with until he has his issuses worked out. Having his dad telling you this means some one thinks this relation ship is very serious You be sure of how you feel about it . If you are serious remember you can't change him if you can live with the things that bother you for the next 50years ok if not draw the lines now.
I wish my daughter had listened to this advice now she is going though all kinds of stuff that may end up in divoice.
Praying for you.(ps glad your back.)